Replacing The Pump Drive Belt; Adjusting The Push Arms - Toro 74448 Operator's Manual

1. Fixed idler arm
2. Square hole
3. Fixed Idler pulley
5. Remove the old belt.
6. Install the new belt through the belt guide and on
the pulleys (Figure 44).
7. Insert a ratchet with a short extension or a breaker
bar into the square hole in the fixed idler arm
(Figure 45).
1. Ratchet with short
extension or breaker
bar
8. To increase the belt tension, rotate the ratchet or
breaker bar counterclockwise to move the fixed
idler arm until you feel increased resistance and the
spring-loaded idler pulley stops moving.
Note: Do not increase the belt tension beyond the
point where the fixed idler arm stops.
9. While holding the belt in tension, tighten the 2 bolts
that secure the fixed idler arm.
10. Remove the ratchet or breaker bar from the square
hole in the fixed idler arm.
11. Install the belt covers over the outside spindles.
Figure 44
4. Mower belt
5. Belt guide
6. Spring-loaded idler pulley
Figure 45
2. Square hole

Replacing the Pump Drive Belt

Service Interval: Every 50 hours
1. Remove the mower belt first; refer to Replacing the
Mower Belt.
2. Remove the bolt from the clutch stop and unplug
the clutch electrical wire (Figure 46).
3. Pull the spring loaded idler to the side.
4. Remove the traction belt from the engine and the
hydraulic pump pulleys (Figure 46).
5. Install the new belt around the engine and the
hydraulic pump pulleys (Figure 46).
6. Pull the spring-loaded idler to the side and align the
belt.
7. Release the pressure on the spring loaded idler
(Figure 46).
8. Install the mower belt.
1. Belt
2. Clutch electrical wire
3. Clutch stop

Adjusting the Push Arms

If needed, adjust the push arms to increase or decrease
the mower belt tension.
1. Loosen the jam nut and rotate the ball joint
counterclockwise, one turn at a time (Figure 47).
37
Figure 46
4. Bolt
5. Clutch
6. Idler